Abstract
Abstract A theoretical model of a random Brillouin dynamic grating (BDG) has been established and numerically demonstrated. Two random pump pulses with random variations in different repetition frequencies are utilized to generate the random BDG in polarization maintaining fiber (PMF). The results show that the position distribution of each BDG constituting the whole random BDG is random along the PMF. The reflection characteristics of the random BDG are further analyzed in detail. We find that the pulse width of the pump waves ultimately affects the reflection spectrum width. The bandwidth of the reflection spectrum decreases with the increase of the pump pulse width. This is a flexible random BDG bandwidth control method for some potential applications in fiber sensing or data storage technology.
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